RonP has a thread (?) Under " Coop Construction etc) titled "How do you heat nest boxes?". A very good, clear article if you have power in your coop. He lists the parts he used with pictures. I have mine done as per his directions and it works well here in lower SW Michigan. Sorry, I canot...
I selected several things in the survey that I do but more toward keeping chickens as opposed to improve egg laying.
The things I have done to the nest boxes came from somewhere here on BYC. When I constructed my coop, I had read that the hens did not like flat bottomed nests. The article...